Stoker air control



. April 19 ',V, 1927;

Sheets-Sheet -1 O. O. NYGAARD STOKER AIR CONTROL original Filedjmlamh 25. 1923 April 19, 1927.

Q0. im/GAARDA STOKER AIR CONTROL originalmled Maiora 25. `1923 `2 shears-Sheet -2 Patented 'piz 19,1927.

l YUNlTEusTATEs /PATENTQFFICBLf osuna o. NYGAARD, or sAUeUaMAssACHUsETrs, assrcmon 'ro"'comus'r1o1v ENGI- NEERING conronATIoN, `orynnvv YORK, N.-

A coaPonA'rIoNaoF NEW Yonne-12 s'roxnn AIR contener..

e Original application filed March 23, 1923, Serial No. 627,065. Divided and this-application filed, February 9, 1926'. Serial No, 87,145.

My present invention relates to stokers, and more particularly to an improved apparatus for distributing and regulating the flow of air to the fuel bed in automatic stokers.

In stoking apparatus, and particularly automatic stoking apparatus of the types in use at the present day. and withthe type of 'fuel necessarily employed therewith, it becomes essential for the proper economical working of the apparatus to provide oxygen containing Huid, such as air, to the fuel bed in proportion to the depth of fuel in the bed at any oint throughout the length;

thereof and in t past, although manyattempts have been made to devise means for regulating the amount of air passing through the fuel bed, all such devices have failed to'I function properly as they operated over too great' an area of the fuel bed.`

The tendency in automatic stokers is, at the present day, for the units to become larger and larger, with the result that the difference inthe thickness of the fuel bed on the grate at the receiving endor inlet end and at the dumping or exit end is' continually in creasing. p i n In my copending application, Serial No. 627,065, filed March 23, 1923, Patent No.

3o 1,598,001 I have described and claimed an improved apparatus for'regulating the flow of air to the fuel bed in automatlc stokers and the present invention is to be considered as a'division of such application, the form of apparatusherein described and claimed having been disclosed in said copending application. y

The object of my invention, therefore, is an improved apparatus for regulating 'and predetermining the amount l'of air passing through a plurality of superimposed tuyre 4blocks comprising a tuyre and into and through the fuel bed.`

In the accompanying'drawings illustrating the preferred embodiment of my invention,

- Fig. 1 is a longitudinal section through the center of a row of tuyre blocks'com- -prising a tuyere showing my invention associated therewith;

Fig. --2 is av fragmentary longitudinal section on an enlarged scale of a pair of tuyre blocks assemble y Ifilling blocks thereto.'

Fig. 3 is a plan view of the structure shown in Fig. 2; 55 Fig. 4 is a perspective view of one of the blocks used with a tuyre shown in Figs. l! 2 i Fig. 5 isa perspective view of a different forpi of block than that shown in Fig. 4, anc a Fig. 6 is a plan view of a tuyre block showing a modifiedA manner of attaching the Referring to thedra'wings, 10 designates 65 va foundation on'which are mounted spaced fuel troughs 11 (but one of which is shown), these yfuel troughs constituting supports forthe tu yres and 12 designates a portion of the brick masonry enclosing the Stoker` apparatu'sa channel iron 13 extending across the lfurnace and acting as a support' for the front ends of the fuel troughs 11, a plate 14 closing the space extending between theside walls of the furnace, the base 10 and uthe 75 channel iron 13. Between adjacent fuel troughs and on the upper edge o f such troughs is placed a tuyre. The tuyere,ba se and apparatus justdescribed form practically a wlnd or pressure chamber-"15, and extending upward through'the base' 10 is an air supply pipe 16 provided with a damper 17 operated in any suitable manner and by means of which the supply of air to the wind or pressure chamber is controlled. Referring now vparticularl to Figs. 2 and 3, there are shown a plura ity of tuyre blocks in superimposed relationv and designated generally by the -numeral 18. Each tuyre block consists essentially of'a Hoor plate 19, provided with -upstanding portions 2O adapted to engage with the under face of theloor plate 19 on the next upper adjacent tuyre block 18 and on its under face with a downwardly extending rojection 21 adapted to fit into a correspon in perforation 22 in the next lower adjacent oor plate 19 of the tuyre block 18, and at its extreme forward end is provided with a downwardly and forwardly extendingv member 23 that extends 100 into a perforation 24 near the forward end of the next lower' adjacent floor plate. Further, each door plate 19 is provided with a plurality of perforations 26, the line' of whichv perforations approximately follows 105. the contour of the forward end of the block.

This construction enables me to build up a tuyre consisting essentially of a plurality of spaced blocks which, were no other means employed, would allow a flow of air thru the space between the adjacent spaced blocks and into the fuel bed. To regulate the ilow of air in accordance with the depth of'uel atany Joint along the length of the tuyre, I proviile a plurality of pillow blocks 27 or 28, each of which is provided with a downwardly extending projection 29 or 30 respectively, which projections are of a size and shape to be inserted into the perforations 26 in the floor plates 18 of the tuyre block. The perforatlons 26 are numerous enough and s o s aced that by plugging into a predetermined3 number of such perfora-` tions, one or the other of the downwardly extending members 29 or.30, I am enabled to block oif a predetermined amount of the space between adjacent tuyre blocks 18 and in this manner regulate and predetermine the available cross section between tuyre blocks through which air may flow.

`Referring now to Fig. 6 wherein is shown a modified form of tuyre block and means for reffulating the amount of air flowing through adjacent blocks, 3l designates the plate, the extreme rearward portion of which is provided with a plurality of parallelly arranged perforations 32 extendine' transversely of the block and in such perorations I may fit blocks either'cf the type shown in Fig. t or of the type shown in Fig. 5 and in this manner predetermine the open spaces between adjacent blocks and those regulating the amount of air that may pass from the wind chamber 15 through the tuyre and into the fuel bed. l

`Having thus described my invention, what I claim as new isz.

1. An apparatusl for controlling the admission of air from the fuel bed into a Stoker, which comprises, in combination, a fuel Lezama 2. In an automatic st'okcr, a tuyere com-Vv prising a plurality of tuyre blocks arranged parallel to each other in stacked relation, each tuyre block comprising a floor plate and means removabl attached to each floor plate and extending between said floor plate and the next adjacent upper plate for partially closing the space between said .plates and thereby predetermining the amount of air passing through each tuyre and between adjacent plates.

3. In an automatic Stoker, a tuyre comprising a plurality of tuyre blocks arranged parallel to each other in stacked relation, each tuyre block comprising a floor plate and means removably attached to each'iloor plate and extending between adjacent floor plates for partially closing the space be tween adjacent floor plates to thereby predetermine the amount of air passing through each tuyere between adjacent iloor plates.

4. In an automatic Stoker, a tuyre comprising a plurality of tuyre blocks arranged parallel to each other in stackedI relation and in an inclined plane, each of said tuyre blocks comprising a plate or floor and means removably mounted on each plate and extending between said plate and the next adjacent plate of the next adjacent tuyre block whereby the space between adjacent plates of adjacent tuyere blocks is partially closed and the amount of air passing through each tuyre between adjacent plates is predetermined.

In testimony whereof, I have signed my name to this specification.

OSCAR O. NYGAARD. 

